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Why is CEF required for CAR to work?

nasir
Beginner
Beginner

From product feature description to the configuration guide I come across the statement that CEF should be turned on before CAR can be configured. Can someone please explain why?

Will CAR not work without CEF?

4 Replies 4

Harold Ritter
Cisco Employee
Cisco Employee

This feature is only supported in the CEF switching path and won't work unless CEF is enabled globally and on the interface.

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Thanks!

ruwhite
Rising star
Rising star

Because CAR is implemented as part of the CEF switching path--it's reliant on the CEF data structures, or data structure built into the hardware on specific line cards.

Russ.W

Thanks, I guess to understand at what step CAR is really implemented I have to check out the CEF order of operation.

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